Science
Fault Lines
Every week, two geology obsessives pick apart a single moment that changed everything about this planet.
Listen on
Episodes
The archive
14 episodes, newest first.
- The Core That Changed Its MindFifty million years ago, deep beneath an Eocene ocean, Earth's magnetic poles began a transition that would take seventy thousand years to complete, far longer than the reversals scientists thought they understood. This episode asks whether the geomagnetic reversal record is even complete, or whether long 'quiet' stretches in the rock are hiding transitions erased from the geological archive. Ola and Amara work through a 2026 Eocene paleomagnetic study, a statistical hunt for four missing reversals hidden after the Cretaceous Normal Superchron, and new satellite data showing the core's flow beneath the Pacific abruptly switching direction in 2010. Anyone who assumes Earth's magnetic shield is a steady, predictable machine will walk away rethinking that assumption.
- The Day the Ground Broke the Sound BarrierOla and Amara finally cover the thing in the show's title: how faults actually rupture. Two 2026 studies on Myanmar's Sagaing fault and California's Cajon Pass suggest the rules seismologists use to size up hazard are missing something.
- When the Permian Oceans Stopped BreathingOla and Amara put the Great Dying on trial, testing a new Stanford-led PNAS study that says heat and oxygen loss picked the winners and losers 252 million years ago against decades of rival theories.
- The Two Hours That Charbroiled EarthA new Purdue-led study says a global blanket of fine dust, not the fireball or a slow impact winter, cooked most of life on Earth within hours of the Chicxulub impact. Ola and Amara put three kill mechanisms on trial.
Show moreShow less
- The Oddball Rock That Killed the DinosaursA brand-new nickel isotope study just identified the exact rare class of asteroid that hit the Yucatán 66 million years ago, and Ola and Amara argue about what it means for the sulfur-versus-dust extinction debate.
- The Zircons That Rewrote Earth's First ChapterOla and Amara report live from Goldschmidt 2026 in Montreal, checking their conference predictions against what geochemists actually presented on early Earth zircons, ancient ocean isotopes, and volatile origins.
- The Last Animal Cambrian ForgotOla and Amara reconstruct the Cambrian explosion through its final missing piece: bryozoans. A June 2026 Nature paper finally proves this colonial phylum was present 520 million years ago, and the hosts argue about what that means alongside a rival April 2026 hypothesis claiming brains, not shells, drove the whole event.
- When Our Ancestors Skipped the TadpoleA study published this week in Science just overturned the textbook story of how vertebrates conquered land. Ola and Amara dig into 300-million-year-old baby fossils from Illinois and argue about what it means for everything we thought we knew about the water-to-land transition.
- The Rock That Built a WorldSixty-six million years ago, a 10-kilometer asteroid ended the Cretaceous. Two 2026 studies now show it also started something: an underground hydrothermal system that ran for 8 million years and new species appearing in under 2,000. Ola and Amara argue about what that changes.
- The Volcano That Dimmed the SunThirty-five years after Mount Pinatubo sent 17 million tonnes of sulfur dioxide into the stratosphere and shaved half a degree off global temperatures, Ola and Amara use it as a measuring stick for Earth's truly catastrophic volcanic events: Toba, the Deccan Traps, and the two-million-year eruption that ended most life on Earth.
Talent
Talents in this show
Each one has a profile of their own.
About
What the show is
The asteroid that killed the dinosaurs. The day oxygen poisoned the atmosphere. The snowball that froze Earth from pole to pole. Each episode reconstructs one turning point in deep time, walks through the competing scientific theories, and argues about what the evidence actually proves. Built for curious people who want to understand how Earth became the place we live on, with no geology degree required.
More shows
Elsewhere in the directory
Every one of them is made with Mato.
